VISA and Worldpay have admitted an error on the multiple charges of Coinbase users.
After initially blaming Coinbase for the charges, VISA and Worldpay have now released a joint statement on the issue, taking the responsibility for the incident. Supposedly most of the charges have already been reversed.
VISA and Worldpay state the following:
"Worldpay and Coinbase have been working with Visa and Visa issuing banks to ensure that the duplicate transactions have been reversed and appropriate credits have been posted to cardholder accounts. All reversal transactions have now been issued, and should appear on customers’ credit card and debit card accounts within the next few days. We believe the majority of these reversals have already posted to accounts. If you continue to have problems with your credit or debit card account after this reversal period, including issues relating to card fees or charges, we encourage you to contact your card issuing bank.
We deeply regret any inconvenience this may have caused customers."
https://blog.coinbase.com/joint-statement-from-visa-and-worldpay-for-coinbase-customers-9a6f2ff5f3b3